What are the causes of sudden pain in the left lower abdomen?

The most common organs in men are the ureter and bladder. Problems with the descending colon, sigmoid colon, and retroperitoneum can also cause similar pain. Therefore, if a man presents with left abdominal pain, first check for problems with these organs. If sudden left abdominal pain occurs, consider whether the patient is caused by certain ureteral stones or abdominal aortic dissection. If the patient's left lower abdominal pain is accompanied by some abnormal defecation, such as some mucopurulent bloody stool, accompanied by abdominal distension, abdominal pain, etc., it should be considered whether it is caused by intestinal problems. For example, intestinal obstruction caused by various reasons, such as intestinal tumor will cause this pain. Moreover, some corresponding examinations should be done according to the patient's symptoms. If intestinal diseases are suspected, abdominal plain film and colonoscopy should be done to confirm the diagnosis. Suspected urinary system disease can improve color Doppler ultrasound, urine routine examination to help diagnose.